Optical flow SDK 1.1 Errors

I am using Nvidia optical flow SDK 1.1 on Ubuntu 18.04, Cuda 10.2, GPU 1660Ti.
I am computing the optical flow between a sequence of frames.
Everything works well for a while until suddenly the program crashes.
I have tries to use the Nsight debugger, but this one crashes at the end of the first optical flow calculation.

I attach here first the errors I get when running from the command line, and then the Debugger errors.

The errors I get when running from the command line:

!!!Error signal 11:
/nmr/local/ver13/13.6/nmr/Release/lib/libnmrSystemCPU.so(+0xebdb)[0x7f68683f6bdb]
/lib/x86_64-linux-gnu/libc.so.6(+0x3efd0)[0x7f6866476fd0]
/usr/lib/x86_64-linux-gnu/libcuda.so.1(+0x217d25)[0x7f685f127d25]
/usr/lib/x86_64-linux-gnu/libcuda.so.1(+0xf758a)[0x7f685f00758a]
/usr/lib/x86_64-linux-gnu/libcuda.so.1(cuCtxPopCurrent_v2+0x59)[0x7f685f17b029]
/usr/lib/x86_64-linux-gnu/libnvcuvid.so.1(+0x71fe4)[0x7f67ed749fe4]
/usr/lib/x86_64-linux-gnu/libnvcuvid.so.1(+0xee234)[0x7f67ed7c6234]
/usr/lib/x86_64-linux-gnu/libnvidia-opticalflow.so.1(+0x3bc5)[0x7f67edbf3bc5]
/nmr/local/ver13/13.6/nmr/Release/lib/libnmrOflCPU.so(_ZN19NvOFBufferCudaArrayD1Ev+0x4a)[0x7f6868f66c9a]
/nmr/local/ver13/13.6/nmr/Release/lib/libnmrOflCPU.so(_ZN19NvOFBufferCudaArrayD0Ev+0x9)[0x7f6868f66d29]

Nsight Debugger messages:

Coalescing of the CUDA commands output is off.
$1 = 0xff
The target endianness is set automatically (currently little endian)
No source file named nmrDbgCuda.cc.
No source file named nmrOflCuda.cc.
No source file named nmrOflCuda.cc.
No source file named nmrOflCuda.cc.
No source file named nmrOflCuda.cc.
No source file named nmrDbgCuda.cc.
No source file named nmrOflCuda.cc.
No source file named NvOFNmr.cc.
No source file named nmrOflCuda.cc.
No source file named nmrDbgCuda.cc.
No source file named NvOFNmr.cc.
No source file named nmrOflCuda.cc.
No source file named cmnPBitRaisePredict.cc.
No source file named nmrOflCuda.cc.
No source file named NvOFNmr.cc.
[Thread debugging using libthread_db enabled]
Using host libthread_db library “/lib/x86_64-linux-gnu/libthread_db.so.1”.
[New Thread 0x7fffa8e4b700 (LWP 11259)]
[New Thread 0x7fffa864a700 (LWP 11260)]
[New Thread 0x7fffa3e49700 (LWP 11261)]
[New Thread 0x7fffa1648700 (LWP 11262)]
[New Thread 0x7fffa0e47700 (LWP 11263)]
[New Thread 0x7fff9e646700 (LWP 11264)]
[New Thread 0x7fff9be45700 (LWP 11265)]

Thread 1 “nmrEncP” hit Temporary breakpoint 16, main (argc=48, argv=0x7fffffffd738) at /nmr/svn/ver13/13.6/nmr/nmrEncP/modules/utils/nmrEncP.cc:7
7 {
[New Thread 0x7fff9161a700 (LWP 11272)]
[New Thread 0x7fff90e19700 (LWP 11273)]
[New Thread 0x7fff75fff700 (LWP 11274)]

Thread 1 “nmrEncP” hit Breakpoint 13, NMR_NS::CmnPBit::commonRaiseLevelPredictTimeInit (this=0x7fffffffc8c0, bufChl=…, wavLev=…, bufLev=…, wavChl=…, kL=0, isSim=false) at /nmr/svn/ver13/13.6/nmr/nmrCmnP/modules/cmnPBit/cpu/cmnPBitRaisePredict.cc:75
75 if (oflFlag==OFL_METHOD_NVIDIA_CUDA)

Thread 1 “nmrEncP” hit Breakpoint 15, calcFlow (nF=17, inpMovFrames=0x7fffffffba70, floUFrames=0x7fffffffb8e0, floVFrames=0x7fffffffb750, gpuId=0, fwdFlag=true) at /nmr/svn/ver13/13.6/nmr/nmrOfl/modules/oflCuda/cpu/NvOFNmr.cc:60
60 MatNmrCpu<uint8_t> movFrames[nF];

Thread 1 “nmrEncP” hit Breakpoint 11, calcFlow (nF=17, inpMovFrames=0x7fffffffba70, floUFrames=0x7fffffffb8e0, floVFrames=0x7fffffffb750, gpuId=0, fwdFlag=true) at /nmr/svn/ver13/13.6/nmr/nmrOfl/modules/oflCuda/cpu/NvOFNmr.cc:65
65 nC = movFrames[0].getNCols();

Thread 1 “nmrEncP” hit Breakpoint 8, calcFlow (nF=17, inpMovFrames=0x7fffffffba70, floUFrames=0x7fffffffb8e0, floVFrames=0x7fffffffb750, gpuId=0, fwdFlag=true) at /nmr/svn/ver13/13.6/nmr/nmrOfl/modules/oflCuda/cpu/NvOFNmr.cc:85
85 calcFlow(movFrames, movUVFlows,
[New Thread 0x7fff757fe700 (LWP 11291)]
[New Thread 0x7fff74ffd700 (LWP 11293)]
[Thread 0x7fff74ffd700 (LWP 11293) exited]
[Thread 0x7fff757fe700 (LWP 11291) exited]
warning: Cuda API error detected: cuArrayDestroy returned (0x2c5)

Error: Internal error reported by CUDA debugger API (error=CUDBG_ERROR_INVALID_CONTEXT(0x1d)). The application cannot be further debugged.